From the Rolls-Royce experimental archive: a quarter of a million communications from Rolls-Royce, 1906 to 1960's. Documents from the Sir Henry Royce Memorial Foundation (SHRMF).
The development and challenges of implementing four-wheel braking systems.
| Identifier | WestWitteringFiles\K\December1923\ Scan25 | |
| Date | 11th September 1920 | |
| R.R. 295A (100 T) (S.H. 159. 11-9-20) G.{Mr Griffiths - Chief Accountant / Mr Gnapp} 2800 (2) so as to use a lapping jointed shoe backwards, and making the rear shoes longer than the forward shoes, gives us by direct pressure from the foot pedal a fair amount of rear braking. It will be noticed that we are not in favour of the long self servo-ing jointed shoe suggested by Perrot, the first reason being that such brakes could not be passably effective backwards, and moreover to divide the foot pressure between four brakes would leave insufficient braking energy when adequate pull off springs are used to overcome the inevitable friction due to rusty brake shafts, so that I cannot see how there is much hope for working four wheel brakes, at least on a heavy car like ours with-out a servo relay. At this joint I am pleased to say we appear to be getting to understand more of the braking problem generally and have made fairly rapid progress on the altered conditions caused by the introduction of four wheel brakes. The temporary arrangement as fitted to the existing 40/50 (EAC.111.) though having undesirable features, appears to be capable of being made to give fair satisfaction. It is desirable however to change to the E.A.C.11. as soon as ever possible. | ||